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package org.apache.juneau.svl.vars;

import org.apache.juneau.svl.*;

/**
 * A basic variable resolver that returns the first non-null value.
 * 
 * <p>
 * The format for this var is <js>"$CO{arg1[,arg2...]}"</js>.
 * 
 * 
 * <h5 class='section'>See Also:</h5>
 * <ul>
 * 	<li class='link'><a class="doclink" href="../../../../../overview-summary.html#juneau-svl.SvlVariables">Overview &gt; juneau-svl &gt; SVL Variables</a>
 * </ul>
 */
public class CoalesceVar extends MultipartResolvingVar {

	/** The name of this variable. */
	public static final String NAME = "CO";

	/**
	 * Constructor.
	 */
	public CoalesceVar() {
		super(NAME);
	}

	@Override
	public String resolve(VarResolverSession session, String arg) throws Exception {
		return arg;
	}
}
